Method for controlling fuel cell device

A method of controlling a fuel cell device in which an electrolyte membrane is inserted between a fuel electrode and an oxidant electrode, hydrogen is supplied to a hydrogen supply unit of the fuel electrode, and a gas containing oxygen is supplied to a gas supply unit of the oxidant electrode so that power is generated, the method comprising:

• a step of purging the hydrogen supply unit of the fuel electrode by opening a hydrogen discharge passage and discharging the hydrogen inside the hydrogen supply unit and purging the gas supply unit of the oxidant electrode by opening an oxygen discharge passage and discharging the gas inside the gas supply unit when an operation of the fuel cell device ends;
• a step of measuring a voltage between the fuel electrode and the oxidant electrode and determining whether the voltage is greater than a predetermined threshold;
• a step of continuing power generation in the fuel cell device when the voltage is greater than the predetermined threshold;
• a step of depressurizing the hydrogen supply unit and the gas supply unit when the voltage is equal to or less than the predetermined threshold;
• under pressure conditions of outer space, depressurizing the hydrogen supply unit and the gas supply unit by opening the hydrogen discharge passage and the oxygen discharge passage to the outer space, and,
• under an atmospheric pressure, depressurizing the hydrogen supply unit and the gas supply unit by a pump provided in the hydrogen discharge passage and a pump provided in the oxygen discharge passage.